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  1. Signs and Symptoms of Flu | Influenza (Flu) | CDC

  2. Influenza (flu) - Symptoms and causes - Mayo Clinic

  3. Flu (Influenza): Causes, Symptoms, Types & Treatment

  4. Flu Symptoms: Common Signs, Treatments, and Complications

  5. Flu Symptoms: Headache, Sore Throat, Chills, and More - Healthline

  6. Flu or Cold? Know the Differences - WebMD

  7. Symptoms of the Flu: Fever, Aching Muscles, Coughing, and More …

  8. Influenza (Flu) | Influenza (Flu) | CDC - Centers for Disease …

  9. Flu Symptoms | Flu Resource Center | CDC - Centers for Disease …

  10. Influenza (Flu) > Fact Sheets - Yale Medicine